Gun for blasting and spraying



Aug 13, 1946. w R. RUEMELIN I GUN FOR BLASTING AND SPRAYING Filed Sept.7, 1944 2 Sheets-Sheet 1 /x/ K x G NM v wkmmwfiw mun], x n 4 K m \N\\\N\\\ u M a N W in w w \N H w. FiWW NML/ WW Nx N Ll A a Aug 13, 1946 R.RUEMELIN GUN FOR BLASTING AND SPRAYING Filed Sept. 7, 1944 2 Sheets-Sheet 2 Patented Aug. 13, 1946 UNITED STATES PATENT OFFICE GUN FORBLASTING AND SPRAYING.

Richard Ruemelin, Milwaukee, Wis.

Application September 7, 1944, SerialNo. 552,989

Claims. 1

This invention relates to improvements in guns for blasting andspraying.

It. is a general object of the present invention to provide a gun whichmay be used for a variety of purposes such. as Wet or dry sand blastingoperations, Water washing operations, spraying with rust-proofingchemicals, or the spraying of cement mixtures.

A further object of the invention is to provide a device of the. classdescribed in. which there are tandem nozzles, together with means fordelivering dry material, such as sand propelled by compressed air to theinner nozzle, and means for delivering a mixture of said dry materialand a liquid to the outer nozzle.

A further object of the, invention is to providea gun of the typedescribed wherein the outer nozzle, together with the liquid admittingconduit, may be readily detached from the inner nozzle so that thelatter. may be used for the discharge of dry material only.

A further object of the invention is to provide a wet blast gun whereinthere is means for quickly effecting a longitudinal adjustment of theouter nozzle to thereby vary the effective size of the mixing chamber.

A still further object of the invention. is to provide a device of theclass described wherein the dry material discharge orificeof the innernozzle is of less diameter than the inlet opening of the outer nozzle,there being a mixing chamber adjacent said discharge orifice of theinner nozzle which is so arranged that a. vacuum is created in themixing chamber to more efiectively entrain liquid into the stream of drymaterial emerging from said inner nozzle.

A further object of the invention is to provide a construction in whichthe flow of liquid may be controlled or shut off adjacent the nozzle,

and in which there may be a valve for controlling the flow of drymaterial from the inner nozzle.

With the above, and other objects in View, the invention consists of theimprovedgun for blasting and spraying, and all its parts andcombinations, as set forth in the claims, and all equivalents thereof.

In the accompanying drawings, illustrating complete embodiments ofpreferred forms ofthe invention, in which the same reference numeralsdesignate the same parts in all of the views:

Fig. 1 is a longitudinal sectional view through the gun showing theliquid conduit connected thereto;

Fig. 2 is a fragmentary sectional view taken on line 22 of Fig. 1;

Fig. 3 is a. sectional view taken. on line 3-3 of Fig. 1, part of thevalve. being broken away;

Fig. i. is a longitudinal sectional view through a modified form of gun;

Fig. 5 is a sectional View taken on line 5-5 of Fig. 4; and

Fig. 6 is an. elevational view illustrating the gun connected to asource of supply for compressed air and, dry material, part of themechanism being broken away, and shown in vertical section.

Referring first to Figs. 1 to 3 inclusive, the numeral 8 designates thevouter end of a hose, preferably formed of rubber, and this hose may leadfrom a source. of dry material propelled by compressed air. This drymaterial may be sand or other abrasives, powdered cement, or the like.The hose end 8 is connected within the bore 9 of sleeve #0 and the innerend of the hose may abut against av shoulder ll. Outwardly of theshoulder H is a bore l2 of smaller diameter. Within thev bore I2 is arubber ring [3 having a taperedbore l4.

An inner nozzle member I5 is connected by a nut l6 with the outer end ofthe sleeve In, there being a rubber gasket I! between the inner end ofthe nozzle l5 and the outer end of the rubber ring, and there beinganother gasket 18 within the nut member Hi. The nozzle I5 is formed witha. duct which includes a tapered section. I9 and an. outer straightsection 2U of restricted diameter communicatingwith the discharge end ofthe inner nozzle l5.

A tubular injector housing 2! has a bore 22 which is preferably of thesame diameter as the external diameter of the outer end of the innernozzle IS. A ferrule 60, fitted on the end of the nozzle 15, has ears 6|which are connected to ears 62 of the injector housing by bolts. 63 tohold the housing in position. The ferrule may be removably held in placeby a set screw 23. The main bore 22 of the. housing 2| communicates witha bore 24 of smaller diameter at the outer end of the housing, and thislatter bore receives the inner end of an outer nozzle member 25. Theouter nozzle member is adjustably heldin position by a bolt 26.

The main bore 22 of the injector housing is of. substantially largerdiameter than the inner end of the outer nozzle member 25 so that amixing chamber 2'! is formed therearound. The inner end of the outernozzle is spaced outwardly from the orifice of the inner nozzle so thatdry material discharged from the inner nozzle can entrain. liquid fromthe mixing chamber as it passes into the bore 28 of the outer nozzlemember. The bore 28 is of substantially larger diameter than the outerorifice 20 of the inner nozzle so that a vacuum condition is created inthe mixing chamber as the dry material passes therethrough. The innerend of the bore 28 is preferably flared as at 29.

A conduit 3|] for water or for a chemical solution under pressurecommunicates with the periphery of the mixing chamber 22, there being a,liquid control valve 3| in said conduit. Slidable transversely of theinjector housing through slots 32 is a slide valve 33 having an opening34. The slide valve is movable against the outer end of the inner nozzleI5, and serves to control the discharge of dry materialtherefrom. Theends of the slide valve may be equipped with suitable stops 35 and 35.When the stop 35 is in engagement with the top of the injector housing,then the valve opening 34 is in registration with the orifice 20, andpermits the discharge of dry material. When the stop 36 is in engagementwith the lower side of the injector housing, then the discharge ofmaterial is shut oil.

In the modified form of the invention illustrated in Fig. 4, the parts8, 9, H), H, I2, i3, I4, l, l1, l8, I9, and 2D, correspond inconstruction and function to the unprimed parts having correspondingnumerals in the form of the invention in Fig. 1 and will not be againdescribed in detail.

In this modification, however, the injector housing, designated by thenumeral 31, is of in creased length and surrounds the entire innernozzle portion. The inner end of the injector housing 31 is in the formof a nut, as at 38, to hold the parts in assembled position on thesleeve Hi". The outer end of the injector housing is threaded as at 39to receive a coupling nut 40. Th latter serves to removably connect theouter nozzle 4| to the outer end of the injector housing 31, there beinga rubber gasket 42 at the joint.

A pipe 30, corresponding to the pipe 30 of the form of the invention ofFig, 1, which is similarly equipped with a valve, such as the valve 3|of Fig. 1, is adapted to discharge liquid into a chamber 43 surroundingthe exterior of the nozzle 15. This chamber is of larger diameter thanthe external diameter of the inner nozzle. The outer end of the chamber43 is connected by a tapered offset 44 with a discharge orifice 45 ofsmaller diameter, there being a mixing chamber portion 45 in front ofthe outer end of the inner nozzle t5.

Dry material which is discharged from the orifice 20 entrains liquidfrom the annular chamber 43 into the mixing chamber, and the mixture isdirected into a flared inner end portion 4'! of the bore of the outernozzle, It is to be noted that the end of the flared bore portion 41 isof substantially larger diameter than the adjacent outlet end of theduct 20' of the inner nozzle. The mixture from the flared bore portion41 is directed outwardly into and through a straight discharge bore 48of the outer nozzle.

Fig. 6 illustrates a typical hookup of a gun with mechanism forsupplying abrasive material and compressed air. Referring to saidfigure, the numeral 49 designates a hopper for the dry material, and thenumeral 50 is a conduit for supplying compressed air, The compressed airconduit has a branch line 5| which communicates with the interior of thehopper, and there are valves 52 a r 1d 53 on each side of said branchline. When the valve 54 at the bottom of the hopper is opened, thecompressed air and gravity will force dry material from the hopper intoa chamber 55. Compressed air from the line 56 will pick up said materialand convey it through the hose 8 to one of the guns heretoforedescribed. A manual valve 51 may control the admission of the dry blastinto the hose 8.

From the above description it is apparent that, in both for-ms of thegun, the dry material is discharged from a relatively small orifice ofan inner nozzle toward a relatively large opening of an outer nozzle,there being a space between the adjacent ends of the two nozzles wherethe sand or other dry material effectively entrains liquid into themoving stream in a manner as to produce an excellent mixture. By havingthe dry material pass through the inner nozzle, the control valve 3| forthe liquid may be shut off whenever desired to permit the discharge ofdry material only. Furthermore, in the form of the invention of Fig. 1,by loosening, the set screw 23, the gun may be quickly converted into adry blast device. The same object may be accomplished by removing theouter nozzle 4| from the structure of Fig. 4. In the form of theinvention of Fig. l, the slide valve 33 provides for convenient manualcontrol of the dry material at the nozzle.

Various changes and modifications may be made without departing from thespirit of the invention, and all of such changes are contemplated as maycome within the scope of the claims.

What I claim is:

1. A gun for blasting and spraying, comprising an inner nozzle having aduct therein, means for supplying dry material under pressure to theduct of said inner nozzle, an outer nozzle having a duct communicatingwith its inner end, means connecting the inner end of said outer nozzleadjacent the outer end of said inner nozzle with a space between saidadjacent nozzle ends, means for admitting liquid to said space, and avalve on said gun positioned to coact with the duct of the inner nozzlefOr controlling the flow of material from the inner nozzle to saidspace.

2. A gun for blasting and spraying, comprising an inner nozzle having aduct therein, means for supplying dry material under pressure to theduct of said inner nozzle, an outer nozzle having a duct communicatingwith its inner end, means connecting the inner end of said outer nozzleadjacent the outer end of said inner nozzle with a space between saidadjacent nozzle ends, means for admitting liquid to said space, and aslide valve operable in said space adjacent the outer end of the innernozzle for controlling the flow of material from said end.

3. A gun for blasting and spraying comprising an inner nozzle having aduct therein, means for supplying a dry material under pressure to theduct of said inner nozzle, an outer nozzle having a duct communicatingwith its inner end, means connecting the inner end of said outer nozzleadjacent the outer end of said inner nozzle with a space between saidadjacent nozzle ends, means for admitting liquid to said space, and avalve on said gun positioned fo quick manipulation by the operator whileholding the gun for controlling the flow of dry material from the innernozzle.

4. A gun for blasting and spraying, comprising an inner nozzle having aduct therein, means for supplying dry material under pressure to theduct of said inner nozzle, an outer nozzle having a duct communicatingwith its inner end, means connecting the inner end of said outer nozzlead- .iacent the outer end of said inner nozzle with a space between saidadjacent nozzle ends, means for admitting liquid to said space, and avalve operable in said space adjacent the outer end of the inner nozzlefor controlling the flow of material from 'said end.

5. A gun for blasting and spraying comprising an inner nozzle having aduct therein, means for connecting the inner end of said inner nozzle toa source of supply for one blasting material; an outer nozzle assemblyincluding an outer nozzle having a duct communicating with its innerend, a tubular connection member secured to the outer nozzle and havinga chamber therein communicating with the inner end of the outer nozzle,and said outer nozzle assembly also including a conduit projectinglaterally therefrom for supplying a second blasting material to saidchamber; and means including laterally projecting cooperating members onthe inner end of the connection member and outer end of the inner nozzleproviding a quickly detachable connection between said connection memberand the outer end of the inner nozzle with a mixing space between saidadjacent nozzle ends and communicating with the connection memberchamber whereby the outer nozzle assembly may be quickly detached as aunit to permit use of the inner nozzle alone.

RICHARD RUEMELIN.

